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<title>SSL_set_bio</title>
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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>SSL_set_bio, SSL_set0_rbio, SSL_set0_wbio - connect the SSL object with a BIO</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/ssl.h&gt;

 void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);
 void SSL_set0_rbio(SSL *s, BIO *rbio);
 void SSL_set0_wbio(SSL *s, BIO *wbio);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>SSL_set0_rbio() connects the BIO <b>rbio</b> for the read operations of the <b>ssl</b> object. The SSL engine inherits the behaviour of <b>rbio</b>. If the BIO is nonblocking then the <b>ssl</b> object will also have nonblocking behaviour. This function transfers ownership of <b>rbio</b> to <b>ssl</b>. It will be automatically freed using <a href="../man3/BIO_free_all.html">BIO_free_all(3)</a> when the <b>ssl</b> is freed. On calling this function, any existing <b>rbio</b> that was previously set will also be freed via a call to <a href="../man3/BIO_free_all.html">BIO_free_all(3)</a> (this includes the case where the <b>rbio</b> is set to the same value as previously).</p>

<p>SSL_set0_wbio() works in the same as SSL_set0_rbio() except that it connects the BIO <b>wbio</b> for the write operations of the <b>ssl</b> object. Note that if the rbio and wbio are the same then SSL_set0_rbio() and SSL_set0_wbio() each take ownership of one reference. Therefore, it may be necessary to increment the number of references available using <a href="../man3/BIO_up_ref.html">BIO_up_ref(3)</a> before calling the set0 functions.</p>

<p>SSL_set_bio() is similar to SSL_set0_rbio() and SSL_set0_wbio() except that it connects both the <b>rbio</b> and the <b>wbio</b> at the same time, and transfers the ownership of <b>rbio</b> and <b>wbio</b> to <b>ssl</b> according to the following set of rules:</p>

<ul>

<li><p>If neither the <b>rbio</b> or <b>wbio</b> have changed from their previous values then nothing is done.</p>

</li>
<li><p>If the <b>rbio</b> and <b>wbio</b> parameters are different and both are different to their previously set values then one reference is consumed for the rbio and one reference is consumed for the wbio.</p>

</li>
<li><p>If the <b>rbio</b> and <b>wbio</b> parameters are the same and the <b>rbio</b> is not the same as the previously set value then one reference is consumed.</p>

</li>
<li><p>If the <b>rbio</b> and <b>wbio</b> parameters are the same and the <b>rbio</b> is the same as the previously set value, then no additional references are consumed.</p>

</li>
<li><p>If the <b>rbio</b> and <b>wbio</b> parameters are different and the <b>rbio</b> is the same as the previously set value then one reference is consumed for the <b>wbio</b> and no references are consumed for the <b>rbio</b>.</p>

</li>
<li><p>If the <b>rbio</b> and <b>wbio</b> parameters are different and the <b>wbio</b> is the same as the previously set value and the old <b>rbio</b> and <b>wbio</b> values were the same as each other then one reference is consumed for the <b>rbio</b> and no references are consumed for the <b>wbio</b>.</p>

</li>
<li><p>If the <b>rbio</b> and <b>wbio</b> parameters are different and the <b>wbio</b> is the same as the previously set value and the old <b>rbio</b> and <b>wbio</b> values were different to each other then one reference is consumed for the <b>rbio</b> and one reference is consumed for the <b>wbio</b>.</p>

</li>
</ul>

<p>Because of this complexity, this function should be avoided; use SSL_set0_rbio() and SSL_set0_wbio() instead.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>SSL_set_bio(), SSL_set0_rbio() and SSL_set0_wbio() cannot fail.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/SSL_get_rbio.html">SSL_get_rbio(3)</a>, <a href="../man3/SSL_connect.html">SSL_connect(3)</a>, <a href="../man3/SSL_accept.html">SSL_accept(3)</a>, <a href="../man3/SSL_shutdown.html">SSL_shutdown(3)</a>, <a href="../man7/ssl.html">ssl(7)</a>, <a href="../man7/bio.html">bio(7)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>SSL_set0_rbio() and SSL_set0_wbio() were added in OpenSSL 1.1.0.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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